A85.1

Billable

ChapterA00–B99

Ranksubcategory

Official Description

Adenoviral encephalitis

Metadata & Insights

•2026 ICD-10-CM Edition - Effective October 1, 2025.
•Billable/specific code (valid for reimbursement).
•Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99).

Instructional Notes

Includes

Adenoviral meningoencephalitis

General instructions are available for the parent sections:

View CH1 Notes View A80-A89 Notes View A85 Notes

Clinical Hierarchy

CH1Certain infectious and parasitic diseases (A00-B99)

A80-A89Viral and prion infections of the central nervous system (A80-A89)

A85Other viral encephalitis, not elsewhere classified

A85.1Adenoviral encephalitis

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to A85.1:

categoryA85

Other viral encephalitis, not elsewhere classified

View context instructions

blockA80-A89

Viral and prion infections of the central nervous system (A80-A89)

View context instructions

chapterCH1

Certain infectious and parasitic diseases (A00-B99)

View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to A85.1. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

1 raw paths

Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)1 unique routes

in (due to)

adenovirus→A85.1

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 097

Non-Bacterial Infection of Nervous System Except Viral Meningitis with MCC

DRG 098

Non-Bacterial Infection of Nervous System Except Viral Meningitis with CC

DRG 099

Non-Bacterial Infection of Nervous System Except Viral Meningitis without CC/MCC

DRG 974

HIV with Major Related Condition with MCC

DRG 975

HIV with Major Related Condition with CC

DRG 976

HIV with Major Related Condition without CC/MCC

Cross Reference

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